Since 7 years I am a member of ...
Since 7 years I have been a member of ...
--- Is only the 2nd one correct or both of them?
Neither is correct. Here are some correct sentences. eg Since 2010, I have been a member of ...
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Neither is correct. Here are some correct sentences.
eg
Since 2010, I have been a member of ...
Since 7 years ago, I have been a member of ... (I think some people object to the structure 'Since 7 years ago)
I have been a member of ...for 7 years.